-The AND gate of Figure 7- 1 has a HIGH output only when:
A) an unknown frequency is present and the sample pulse input is LOW.
B) an unknown frequency input pulse is HIGH and the sample pulse input is HIGH.
C) the sample pulse input is HIGH and the unknown frequency input is LOW.
D) an unknown frequency is present.

Question

-The AND gate of Figure 7- 1 has a HIGH output only when:
A) an unknown frequency is present and the sample pulse input is LOW. 
B) an unknown frequency input pulse is HIGH and the sample pulse input is HIGH. 
C) the sample pulse input is HIGH and the unknown frequency input is LOW. 
D) an unknown frequency is present.

Quizplus · Accepted Answer

An AND gate outputs a HIGH only when all of its inputs are HIGH. Therefore, for the AND gate to have a HIGH output, both the unknown frequency input pulse and the sample pulse input must be HIGH.

-The AND Gate of Figure 7- 1 Has a HIGH